I can understand this is a frustrating situation for your friend. The answers to your question will depend on a variety of factors specific to your friend's situation. For example, whether or not the employee housing is considered a condition of employment, whether or not there is an employment contract or policy regarding the housing as additional compensation, etc. However, in general, the job duties and compensation of at-will employees (those that don't have contracts or are unionized, etc.) can usually be modified without notice. When ther is no lease agreement, most states would require that 30 day notice of termination of the lease be provided when tenant's pay rent monthly.
Your friend can certainly try to speak to an attorney regarding her legal options. Some do offer free consultations. You can find more information about an attorney through the attorney locator service on LawInfo's home page at:
http://www.lawinfo.com/. Good luck with the new management.